Nintendo Ultra64 Programmer's Manual page 202

NOR
31
SPECIAL
0 0 0 0 0 0
Format:
nor rd, rs, rt
Description:
The contents of general register
logical NOR operation. The result is placed into general register
Operation:
GPR[rd] GPR[rs] nor GPR[rt]
T:
Exceptions:
None
202
26 25 21
rs
6 5
Nor
20 16 15
rt rd
5 5
rs
are combined with the contents of general register
NOR
11 10 6 5
0 NOR
0 0 0 0 0 1 0 0 1 1 1
5
rd
.
0
6
rt
in a bit-wise